A first aspect relates to a
human system interface (HSI) for a contactless control device, in particular for a
medical procedure, the HSI being configured to: generate a
control space; measuring the position of the user, in particular the user's hand, in the
control space; providing a first contactless tactile stimulus to the user in the
control space based on the measured position; measuring a non-contact haptic input from the user in the control space; providing a second tactile stimulus to the user according to the tactile input; based on the haptic input, a parameter of the HSI is changed and / or provided to a device connected to the HSI.